
This paper is an impressive contribution to the theory of \(p\)-local finite groups with a number of very interesting results, including the following two theorems: Theorem A: Let \(p\) be an odd prime. If \(X\) is a \(1\)-connected \(p\)-compact group, \(q\) a prime power prime to \(p\), and \(\tau\) an automorphism of \(X\) of finite order prime to \(p\), then the space of homotopy fixed points of \(BX\) by the action of \(\tau\psi^q\) is the classifying space of a \(p\)-local finite group. Theorem B: Let \(X\) be a connected \(p\)-compact group. If \(G\) is a finite group of order prime to \(p\) and \(\rho : G \to \mathrm{Out}(X)\) and outer action, then the following hold: (1) \(\rho\) lifts to a unique action of \(G\) on \(X\), up to equivalence; (2) \(X^{hG}\) is a connected \(p\)-compact group with \(H^*(BX^{hG};\mathbb{Q}_p) \cong S[QH^*(BX;\mathbb{Q}_p)_G]\), the symmetric algebra generated on the coinvariants \(QH^*(BX;\mathbb{Q}_p)_G\); (3) \(X^{hG} \to X\) is a \(p\)-compact group monomorphism, there is a homotopy equivalence \(X \simeq X^{hG} \times X/X^{hG}\) and \(X/X^{hG}\) is an \(H\)-space; (4) If \(p\) is odd and \(H^*(BX;\mathbb{F}_p)\) is a polynomial ring, then \(H^*(BX^{hG};\mathbb{F}_p)\) is also a polynomial ring.
\(p\)-local finite group, Chevalley group, p-compact group, Classifying spaces of groups and \(H\)-spaces in algebraic topology, Classification of homotopy type, Fusion system, classifying space, homotopy type, fusion system, 55P10, p-local finite group, \(p\)-compact group, Homology of classifying spaces and characteristic classes in algebraic topology, 55R40, Sylow subgroups, Sylow properties, \(\pi\)-groups, \(\pi\)-structure, cohomology, 55R35, 55P15, Homotopy equivalences in algebraic topology, 20D20
\(p\)-local finite group, Chevalley group, p-compact group, Classifying spaces of groups and \(H\)-spaces in algebraic topology, Classification of homotopy type, Fusion system, classifying space, homotopy type, fusion system, 55P10, p-local finite group, \(p\)-compact group, Homology of classifying spaces and characteristic classes in algebraic topology, 55R40, Sylow subgroups, Sylow properties, \(\pi\)-groups, \(\pi\)-structure, cohomology, 55R35, 55P15, Homotopy equivalences in algebraic topology, 20D20
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